package six;

/**
 * Created with IntelliJ IDEA.
 * Description: 第六届（1）
 * User: 王圆豪
 * Date: 2025-05-10
 * Time: 21:10
 */
import java.util.*;

public class Demo1 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long count = 0;
        for(int i = 0; i < 10; i++) {
            for(int j = 0; j < i; j++) {
                for(int k = 0; k < j; k++) {
                    count++;
                }
            }
        }
        System.out.print(count);
        sc.close();
    }
}
